As a smoker and ex smoker, I sympathise. Have you ever been to see the cesation service?
They are very good.
I tried Champix (went a little crazy on it, and smoked, got nothing from the cigarettes but the habit was still there - plus I like smoking which helps not a jot) I've tried just quitting... I'm currently trying my 'crack pipe' not an actual crack pipe not an e-cig but a VIP vapouriser, and so far, so good. I am still a nicotine addict, but I don't like the vapouriser at all (dry throat) and it gives me the 'hit' when I need it.
Everyone will recommend something different, and I completely understand how bloody awful you feel when you commit to something that simply doesn't work for you. KEEP SEARCHING.
I'm also an expert diet failure too, who's finally, after about 25 years found what works for me. There is hope. Keep at it.
There is no solution to quitting smoking. Not every method works for everyone, just keep working your way through it. I HATED the idea of a vapouriser at first because of the cost, and because I'd still be an addict, but hey, baby steps... and at present, skint addict that I am, I don't smell, and I loathe the idea of an actual cigarette (my christmas cigar is another matter though). xxx
Keep at it.
And although it's useless to say, failure is not a failure of YOU, there's nothing wrong with YOU, so do not allow lack of success to knock you to such a degree that you're left with no confidence or self-esteem, counselling may help you with that 'brain fart', because there is nothing wrong with you sweety. You're simply in the grip of something powerful, and you need some help.
I hope you find your solution soon. x